Protecting-bushing for electric-circuit wires.



No. 830,501. PATENTED SEPT. 11; 1906. J. H. GOEHST. PROTECTING BUSHINGFOR ELECTRIC CIRCUIT WIRES.

APPLICATION FILED FEB-16, 1905.

2 SHEETS-SHEET 1 W I v 1 -1 I ill 1 No. 830,501. PATENTED SEPT. 11,1906.

J. H. GOBHST. PROTECTING BUSHING FOR ELECTRIC 011101111: WIRES.

APPLICATION FILED FEB. 18, 1905.

2 SHEETSSHEET 2.

UNITED, STATES PATENT OFFICE.

JOHN H. GOEHST, OF CHICAGO, ILLINOIS, ASSIGNOR TO FEDERAL ELECTRICCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

Specification of Letters Patent.

Patented Sept. 11, 1906.

Application filed February 16,1905. Serial No. 245,918.

To all whom it may concern:

Be it known that I, J 011): H. GOEHST, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Protecting-Bushings forElectric-Circuit Wires; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

This invent-ion relates to improvements in protective bushings forelectric wires where the wire is to be passed through a partition,panel-board, the wall of a cut-out box, or other like location; and theinvention consists in the matters hereinafter set forth, and moreparticularly pointed out in the appended claims.

Among the objects of my invention is to provide in a bushing of thischaracter, which avoids grounding of the wires extending therethrough incase the insulation should be stripped from the wire, means for aflixingthe bushing to the part through which it extends, so as to preventvibration or pulling the wires theret-hrough from loosening the same andto provide an inexpensive insulatingbushing and ready means forfastening the same in place.

As shown in the drawings, Figure 1 is a side elevation of a bushing madein accordance with my invention adapted for use in connection with athin wall or the like.

Fig. 2 is an axial section thereof.

Fi.3isan axial section of a modified form of t e device.

Fig. 4 is a side elevation of a clamping-ring adapted for clamping abushing in place, as shown in Fig. 3. Fi 5 is a side e evation,

artially in section, 0? a still further modified orm of bushing adaptedto extend through Walls or partitions of considerable thickness. Fig. 6illustrates the bushing shown in Fig. 5 set in place. Fi 7 illustrates aspringwasher which is a apted to be interposed between the nut of thebushing shown in Fig. 6 and the art through which the bushing extends.Figs. 8 and 9 are end elevations and vertical sections, res ectively, ofa modified form of bushing. ig. 10 is a perspective view of a clampingring or nut which is to be used with the bushing shown in Figs. 8 and 9.

My improved bushing is made wholly of an insulating material and isprovided at its ends with shoulders or stops by which its endwisemovement is limited when fixed in place and is held in place by asuitable positivelyacting screw-threaded locking device, whereby it isheld reliably in place.

The bushing A (shown in Figs. 1 and 2) is made of a single piece ofinsulating material and consists of a head or flange a, which is shownas peripherally corrugated, and a shank portion a" which is providedwith exterior screw-threads, herein shown as extending practically fromthe shoulder (1 formed by the inner face of the head, to the outer endof said shank.

B designates a locking ring or nut having screw-threaded engagement withthe shank. Said clamping ring or nut is preferably made of sheet metaland is provided at one end with a flange b, which opposes the shoulder aof the bushing and between which clamping pressure is effected whichholds the bushing in place. Ast-he ring and flange are made of sheetmetal, the flange is resilient and acts when the ring is turned tightlyin place to prevent the ring from jarring loose.

The bushing is provided with an axial opening A of sufficient diameterto receive the wire or wires adapted to extend therethrough, and saidopening is rounded on its ends to prevent chafing of the wires againstthe bushing at the ends thereof from wearing the insulation therefrom.In fixing said bushing in place a hole somewhat larger than the shank ofthe bushing is bored through the part to which the bushing is to beattached,

"and thereafter the shank of the bushing is thrust through said hole andclamped in place by the clamping-ring. It will be observed that thebushing extends at both ends beyond the part to which it is attached.The clamping-ring may be fixed to the bushing either ,bymeans o alock-nut or may be cemented thereon.

The bushing C (shown in Fig. 3) comprises a head or flange c and a shankc, which is screw-threaded from one. end thereof to the other. Saidbushing is fixed in place by means of a screw-threaded sheet-metal ringor nut D engaging the screw-threads of said shank and provided with aspring-flange d, which has a concave form to increase the resome lengthand is screw-threaded throughout the length of its shank. This bushingmay therefore be made to adapt itself to parts of varying thiclmess, itonly being necessary to break ofl a portion of the end there- -of incase the bushing projects t'oo farfrom the part through which itextends. In Figs. 5 and 6 I have shown a bushing intended to be insertedthrough a wall or like part of considerable thickness. The bushingindicated therein is designated by the reference-letter E and comprisesa head e, having an elongated shank e, that is provided at its extremeend with a short screw-threaded sectione which receives a screw-threadedlocking ring or. nut F. Said locking-ring F is made similar to the ringor nut D described, it having a spring-flange f, which may be radiallyslitted, as shown. v

In Fig. 6 the bushing is shown in place and extending through a wall orlikepart G of considerable thickness. 'In case such part G be madeofslate, marble, or like brittle mathe teria-l it often occurs when boringthe opening in said part to receive the bushing the drill breaks out thematerial around the outer end of the hole being drilled, as-indicated atg in Fig. 6. In such event it is desirable in order to properly clampthe bushing in place and to afl'orda neat fitting of the bushingto ipartthrough which it extends to make the ange f of the clam ing-nut ofsuflicient diameter to cover said iEroken-out part or to interpose awasher H between the flange of the nut and said part. The washer shownis made of sheet metal and is'slitted ath to increase the resiliencythereof.

In Figs. 8 and 9 I have shown a form of bushing that is designed to beplaced around the wire or wires extending through a Wall, partition, orthe like without disturbing or cutting the wires. For this purpose thebushing (indicated'as a whole by I) is composed 'of two ormorelongitudinally-divided parts i 7., so arranged or constructed thatwhen brought together they form a complete and much as the dividing ofthe 'shank in'the manner described tends to vary the diameter of theshank such slitting of the nut or looking-ring is found to be advisableand advantageous.

I claim as my invention 1. A bushing for protecting electric-circuitwires made wholly of insulating material, and comprising a hollow shankprovided at one end with a hollow head, and at its other end with ascrew-thread, and a thin, sheetmetal, screw=threaded locking-ringengaging said screw-thread and provided with an integral resilientflange opposing said head of the bushing.

2. A bushing for protecting electric-circuit wires made wholl T ofinsulating material, and comprising a ollow shank provided at one endwith a hollow head and at its other end with a screw-thread, ascrew-threaded locking-ring engaging said screw-thread and provided witha flangeopposing said head, a concave spring-washer made larger thansaid locking-ring and interposed between said flange and the partthrough which the bushing extends.

3. A busning for the purpose set forth comprising a hollow shankprovided at one end with a hollow head and at its other end with ascrew-thread and a thin sheet-metal screwthreaded ring engaging said'screw thread of the shank and provided on its inner end with anintegral, slitted, concave flange opposing I' IOO said head. r 4

In testimony that I claim the foregoing as my invention I affix mysignature, in presence of two witnesses, this 7th day of February,

JOHN H. GOEHST. Witnesses: W. L. HALL,

G. R. VILKINS.

